Fire bridge



March 8, 1921.

J. LANGER FIRE BRIDGE Filed March r1. 192s Fig.1.

d B l hmm Q Fig.2.

Patented Mar. 8, 1927.

PATENT OFFICE.

JULIUS LANGER, OF HAMBURG, GERMANY.

FIRE BRIDGE.

Application filed March 17, 1926, Serial No. 95,374, and in Germany February 5, 1926.

Fire-bridges are built into the fire-boxes of steam-boilers thereby, that the single stones are walled up side by side and above one another upon the cast-iron bearer by means of fire-proof mortar. The way of doing this is very tedious and expensive and does not warrant for a sufficient stability of the fi1e-bridge walled up in such manner, because usually already in a short time at the cleaning of the fire by means of the ironrake a looseness of the stones respectively a demolition of the fire-bridge is caused.

Latterly one has done away with the circumstantial and wearisome brick-work of the fire-bridge thereby, that one compound the fire-bridge out of pattern-stones, which were fastened upon the cast-iron bearer by means of vertically screw-bolts, this construction however has also still the substantial disadvantages, that the stones must be hewed, and the holes for the passage of the screw-bolts must be bored into the cast-iron bearer.

The above mentioned disadvantages have now been entirely done away with through the subject of the present invention, while pattern-stones in such measurement are employed, that they can be put into the fire-box upon the cast-iron bearer without even hewing, and that they can be fastened without ado, after passingthe screw-bolts through already existing borings of the cast iron bearer.

The drawing illustrates the subject of the invention by way of example: Fig. 1 shows a fire-box with the tire-bridge in section and back-view and Fig. 2 is a horizontal section on line A-B. The fire-bridge Consists for instance of three pattern-stones a, b and c. The middle piece a is manufactured in standard dimensions of a length of about 12 by 24 inches, Whereas each of the both side-pieces b and c has a length of about 12 inches. The middle openings d of the stones at, b and c are measured in such a manner that they project sufficiently far beyond the right and left side over the borings e of the cast-iron base f, in order to make possible an easy installation of the screw-bolts. The upper part of each opening is provided with an extension d for the head of the screw-bolt g. The stones a, Z) and c engage into each other by means of grooves 91 and tongues j.

It is now easily possible by a suitable choice of the length of the stones at, b and 0 to put together the right total-length of the fire-bridge for any fire-box h and to fasten it upon the cast-iron base f by means of the screws 9 and the building of the fire-bridge can be made very easy within a very short time, and the fire-bridge guarantees a very great stability.

I claim:

A fire bridge comprising a base having spaced openings, a plurality of pattern stones on said base arranged side by side and pr'ovided with coengaging tongues and grooves in their opposing sides, said stones being provided with vertical central openings, the dimensions of which transversely of the stones exceed the diameter of the openings in the base and bolts in said openings in the base and in the stones and having enlarged heads which bear on the upper sides of the stones.

In testimony whereof I am): my signature.

JULIUS LANGER. 

